WhatsApp lets you make and receive calls when internet connection is available. To change WhatsApp ringtone on Android phones and tablets, do as follows:
1. Open the WhatsApp application on your Android device (Make sure it's the latest version)
2. Tap the 3dot icon on the top right, and then go to the Settings.
3. Tap the Notifications option
4. Scroll down and under the Call notifications options, you can change the Ringtone and Vibration status
** Note that you can force the application to use the custom contact ringtone by marking the Contact ringtone option